9p: remove SLAB_MEM_SPREAD flag usage

The SLAB_MEM_SPREAD flag used to be implemented in SLAB, which was
removed as of v6.8-rc1, so it became a dead flag since the commit
16a1d968 ("mm/slab: remove mm/slab.c and slab_def.h"). And the
series[1] went on to mark it obsolete to avoid confusion for users.
Here we can just remove all its users, which has no functional change.

Link: https://lore.kernel.org/all/20240223-slab-cleanup-flags-v2-1-02f1753e8303@suse.cz/ [1]
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Message-ID: <20240224134617.829016-1-chengming.zhou@linux.dev>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>

fs/9p/v9fs.c

@@ -637,7 +637,7 @@ static int v9fs_init_inode_cache(void)
 	v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
 					  sizeof(struct v9fs_inode),
 					  0, (SLAB_RECLAIM_ACCOUNT|
-					      SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+					      SLAB_ACCOUNT),
 					  v9fs_inode_init_once);
 	if (!v9fs_inode_cache)
 		return -ENOMEM;